The term 'Sparkly Rock' can be described by two crossword solutions: Gneiss (6 letters) and Geode (5 letters). Gneiss is a metamorphic rock that is composed of bands of different minerals, often quartz and feldspar. It is usually found in mountain ranges and is known for its sparkly appearance. Geode is a type of rock that is hollow on the inside and filled with crystals. It is often found in sedimentary rocks and is known for its sparkling crystals.